Choosen As Best Answer

11 + (m - 1) * 17 = 7 + (n - 1) * 13
17m -6 = 13n -6
17m = 13n
(m, n) = (13, 17), (下一組不知道是多少)...

11 + (13 - 1) * 17 = 7 + (17 - 1) * 13 = 215

Ans: (B) #

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